None of this can bring instant peace to rough parts of the Amazon, or instant political calm to Papua New Guinea, where a new study says half the trees will have gone by 2021.

• 这一切都不可能给亚马逊的崎岖的地区马上带来和平，或给巴布亚新几内亚马上带来政治平静，一个新的研究显示，到2021年该地区一半的树木将消失。